Atomic absorption spectrophotometer for providing background cor

Details Atomic absorption spectrophotometer for providing background cor Atomic absorption spectrophotometer for providing background cor

1993-04-28

1996-06-18

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

With background radiation comparison

250281, G01J 336

Patent

active

055283624

ABSTRACT:
A lighting circuit part (26) is provided for lighting a hollow cathode lamp (1), to feed a large lighting current (I1) intermittently and periodically across an anode and a cathode by a control signal from a control part (22) while feeding a boost current (Ib) across a boost electrode and the anode in a part of a period when the lighting current (I1) flows across the anode and the cathode. Absorbance including both of atomic absorption of a sample and background absorption is detected with light emitted when the large current (I1) is fed across the anode and the cathode with feeding of the boost current (Ib) while absorbance by background absorption of the sample is detected with light emitted when the large current (I1) is fed across the anode and the cathode with no feeding of the boost current (Ib) so that difference between these absorbance levels is obtained to obtain true atomic absorption corrected as to background absorption. Thus, measurement is made in a high S-N ratio with background correction.

REFERENCES:
patent: 3610760 (1971-10-01), Lowe
patent: 4462685 (1984-07-01), Smith, Jr. et al.
patent: 4885504 (1989-12-01), Green
patent: 4979823 (1990-12-01), Mohr et al.

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